diff --git a/src/api/statistics.php b/src/api/statistics.php
index 03585a76..d6775495 100644
--- a/src/api/statistics.php
+++ b/src/api/statistics.php
@@ -30,7 +30,8 @@ switch ($_SERVER['REQUEST_METHOD']) {
                 foreach ($tables as $table) {
                     $count = new Cache\Query(
                         'SELECT COUNT(`id`) AS "count"
-                           FROM `' . $table . '`;'
+                           FROM `' . $table . '`;',
+                        Duration::DAY
                     );
 
                     $response['data'][$table] = $count->get();
diff --git a/src/classes/cache/blog.php b/src/classes/cache/blog.php
index 3fc8506b..72ae56e5 100644
--- a/src/classes/cache/blog.php
+++ b/src/classes/cache/blog.php
@@ -21,10 +21,9 @@ class Blog extends Cache
      */
     public function __construct($url)
     {
-        parent::__construct($url);
+        parent::__construct($url, \wishthis\Duration::DAY);
 
         $this->directory .= '/blog';
-        $this->maxAge     = 86400; // 24 hours
     }
 
     public function get(): \stdClass|array
diff --git a/src/classes/cache/cache.php b/src/classes/cache/cache.php
index 7bea6432..ef1fcb96 100644
--- a/src/classes/cache/cache.php
+++ b/src/classes/cache/cache.php
@@ -8,12 +8,16 @@ namespace wishthis\Cache;
 
 class Cache
 {
+    /**
+     * Private
+     */
+    private int $maxAge;
+
     /**
      * Protected
      */
     protected string $url;
     protected string $directory = ROOT . '/src/cache';
-    protected int $maxAge       = 2592000; // 30 days
 
     protected function getAge(): int
     {
@@ -50,9 +54,10 @@ class Cache
     /**
      * Public
      */
-    public function __construct($url)
+    public function __construct(string $url, int $maxAge = \wishthis\Duration::YEAR)
     {
-        $this->url = trim($url);
+        $this->url    = trim($url);
+        $this->maxAge = $maxAge;
     }
 
     public function exists(): bool
diff --git a/src/classes/cache/embed.php b/src/classes/cache/embed.php
index 423b3f47..a9d16027 100644
--- a/src/classes/cache/embed.php
+++ b/src/classes/cache/embed.php
@@ -25,7 +25,7 @@ class Embed extends Cache
      */
     public function __construct($url)
     {
-        parent::__construct($url);
+        parent::__construct($url, \wishthis\Duration::MONTH);
 
         $this->directory .= '/embed';
     }
diff --git a/src/classes/cache/query.php b/src/classes/cache/query.php
index 0178a371..5f50fa18 100644
--- a/src/classes/cache/query.php
+++ b/src/classes/cache/query.php
@@ -16,11 +16,11 @@ class Query extends Cache
     /**
      * Public
      */
-    public function __construct($url)
+    public function __construct(string $url, int $maxAge = \wishthis\Duration::YEAR)
     {
         global $database;
 
-        parent::__construct($url);
+        parent::__construct($url, $maxAge);
 
         $this->directory .= '/query';
         $this->database   = $database;
diff --git a/src/classes/duration.php b/src/classes/duration.php
new file mode 100644
index 00000000..9b2af1ea
--- /dev/null
+++ b/src/classes/duration.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace wishthis;
+
+class Duration
+{
+    public const HOUR    = 3600;
+    public const DAY     = self::HOUR * 24;
+    public const WEEK    = self::DAY * 7;
+    public const MONTH   = self::DAY * 30;
+    public const QUARTER = self::MONTH * 3;
+    public const YEAR    = self::MONTH * 12;
+}